hello,
On 3/12/08, fooler mail <[EMAIL PROTECTED]> wrote:
> On Tue, Mar 11, 2008 at 11:23 PM, Edel SM <[EMAIL PROTECTED]> wrote:
> > hello,
> >
> > On 3/11/08, fooler mail <[EMAIL PROTECTED]> wrote:
> > > you cannot benefit the tcp offloading feature of a nic if you put this
> > > on your box acting as a router... the basic mechanism of a router is
> > > to route or forward packets based on the destination address... as the
> > > packets pass on the router... router will only decrease the ip
> > > header's ttl value, if the value is zero, it drops the packet and send
> > > icmp type 11 (time exceeded) back to the sender... if the value is
> > > non-zero.. recompute and updates the checksum in the ip header and
> > > forwards on the next hop based on its routing table...
> >
> > but the NIC consumes cpu power while it process traffic, right? im
> > just thinking of offloading (saving) cpu task and put it in the nic w/
> > its onboard processor. cheap nics relies on main cpu power, while
> > better (and expensive) ones have processor onboard.
>
>
> ill take you to a bigger picture... ill present you moore's law...
> processing speed.. memory capacity.. bandwidth... etc.. increasingly
> at exponential rates... your host's processor and memory buffer are
> much efficient than your nic's processor and memory processing a
> packet... with nic... you are limited to its processing speed and
> memory buffer compare to your host's resources acting as a router...
> although you can apply moore's law on nic... unlike with outgoing
> packets where the host can temporarily put the packets on its big
> buffer while the nic is busy but for incoming packets where if the
> host is too slow fetching the packets from nic's buffer... the nic is
> starting to drop the incoming packets when its buffer is full...
> therefore it is much better to focus increasing the power of your host
> rather than on your nic...
i have this setup currently:
+-----------------+
(frame-relay) | |vlanB
+---telcoA-----------+ pc300
+------------ lan A
| |
|vlanC
internet -------+ |
+------------ lan B
| |
|vlanN
+---telcoB-----------+vlanA
+------------- dmz X
(10mbps fiber) | |
+----------------+
router
public servers are on public dmz, and internal hosts (database & fs)
are in internal dmz. office/building LANs are separated. i have less
than 10 vlans active, with more or less 300 hosts.
that work fine. but somtimes the pc router pauses/hang for a while if
there's so much traffic (FS file transfer, web uploading, etc).
sometimes hte NIC stops responding (hang?) and we need to reboot the
router. it may be also be a problem in the driver, switch, etc.
i use dlink nic, rtl8139 chipset. im just thinking replacing the nic
w/ a better one. and getting good nic. so that's why i asked. what do
you sugest?
>
> that is why others say that tcp offloading engine embedded in a nic is
> a dumb idea...
>
our LAN FS w/ eepro100 (onboard) perform so much better compared to
dlink/8139 nic (the host has extra/standby dlink nic). i have just
thought before that all nics are the same.
thanks.
>
>
> fooler.
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>
--edel
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